java - 将 HQL 转换为条件

Question

我想在标准中转换 HQL。

HQL

select com from News as news " +
            "join news.comments as com " +
            "where news.id = :id " +
            "order by com.addDate desc"

标准

    DetachedCriteria criteria = DetachedCriteria.forClass(News.class);
    criteria.add(Restrictions.idEq(id));
    DetachedCriteria cComment = criteria.createCriteria("comments");
    cComment.addOrder(Order.desc("addDate"));
    List<Comment> list = (List<Comment>)findByCriteria(cComment, false);

标准有效，但返回新闻列表。我想回复评论。请帮助我？

Answer 1

试试这个可能对你有帮助:

DetachedCriteria criteria = DetachedCriteria.forClass(News.class);
criteria.setProjection( Projections.property("com"), "com"));
criteria.add(Restrictions.idEq(id));
DetachedCriteria cComment = criteria.createCriteria("comments");
cComment.addOrder(Order.desc("addDate"));
List<String> list = (List<String>)findByCriteria(cComment, false);